Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Immersion silver pads turn brownish after IR reflow

We encountered a few PCB pads turning brownish after PCBA IR reflow. What is the reason causing this issue?

Lincy Lincy
- Bayan Lepas, Penang, Malaysia
September 15, 2009

Either no nickel barrier or too thin of one. The copper is alloying thru the silver layer. so for the thickness of silver that you have you now have a silver-copper alloy.

James Watts
- Navarre, Florida
September 16, 2009

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: